JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block">
  <input type="text" class="input" value="+923-234-34-34">
</div>

CSS

.block {
  width: 300px;
  height: 200px;
  background-color: #cdc6a5;
}

.input {
  margin-top: 30px;
  margin-left: 30px;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid transparent;
  background-color: transparent;
  text-align: right;
}

.input:focus {
  border: 1px solid #494949;
  background-color: #fff;
  outline: none;
}